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[EN] Data from about 1000 litters were analysed to draw
inferences of genetic parameters for doe litter traits, using restricted
maximum likelihood (REML) procedures based on a doe repeatability
model. The traits under ...[+]

[EN] Data from about 1000 litters were analysed to draw
inferences of genetic parameters for doe litter traits, using restricted
maximum likelihood (REML) procedures based on a doe repeatability
model. The traits under analyses were litter size at parturition (LSB =
9.53 on average), litter size at weaning (LSW = 7.63), mortality during
pre-weaning (Mort =18,02%), average offspring body weight at weaning
(ABW = 7 40 g), and total litter weight at weaning (L TW = 5557 g). The
statislical model contained a permanent environmental effect and that
was significant for only LSW (0.106). The estimates of heritabilities
were 0.188, 0.081, 0.113, 0.196 and 0.194 for LSB, LSW, Mort, ABW and L TW, respectively. Repeatability estimates for these traits were
0.188, 0.187, 0.145, 0.196 and 0.214, respectively. Genetic correlations
between these traits were consistent with environmental and phenotypic
correlations. The correlation between LSB and LSW was strongly
posilive. ABW was negalively correlated with mortality, LSB and LSW.
Mortality was strongly and positively correlated with LSB, but negatively
with LSW. The correlations of L TW with other traits were favourable,
especially strong with LSW and ABW. Thus, seleclion for L TW would
result in an effective overall improvement on litter traits.[-]